The custom-made timepiece is gold with a mother of pearl dial and takes two months to make.

Each one is checked by a member of the Stern family - who own Patek Philippe - at the firm's HQ in Geneva, Switzerland.

A source told The Sun newspaper: "Brad decided to buy one of the amazing watches after meeting the Stern family at a watch fair in Basel. He wanted to buy Angie a unique gift that very few people own which is like a piece of art - and the highly sophisticated watch is just that."

"It chimes sounds based on Big Ben and is constructed by hand. He went to Geneva to pick it up and it's believed he'll present it to Angie as a pre-wedding gift."

Brad, 48, got engaged in to Angelina, 37, in April and they are expected to marry in a ceremony at their French chateau. The couple is currently living in Surrey with their six children.